US7768979B2 - Separating pilot signatures in a frequency hopping OFDM system by selecting pilot symbols at least hop away from an edge of a hop region - Google Patents
Separating pilot signatures in a frequency hopping OFDM system by selecting pilot symbols at least hop away from an edge of a hop region Download PDFInfo
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- US7768979B2 US7768979B2 US11/132,765 US13276505A US7768979B2 US 7768979 B2 US7768979 B2 US 7768979B2 US 13276505 A US13276505 A US 13276505A US 7768979 B2 US7768979 B2 US 7768979B2
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
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- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0012—Hopping in multicarrier systems
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Abstract
Description
Z k,(q,s,c) =S k,q ·X k,s ·Y k,c, 1≦k≦N p, 1≦s≦S, c=1,2, (1)
If sector specific scrambling is not utilized:
Z k,(q,s,c) =S k,q ·Y k,c, 1≦k≦N p, 1≦s≦, c=1,2, (2)
-
- All the elements of cell specific scrambling sequences have equal modulus.
- Cell specific scrambling sequences differ substantially for different cells.
where k is an index for subband, and ha,i(k,t), for i=1 . . . R, is the coupling or complex channel gain between the single antenna at
H u(k,t)=[h u,1(k,t)h u,2(k,t) . . . h u,T(k,t)], for k=1 . . . K, Eq (2)
where h u,j(k, t), for j=1 . . . T, is the channel response vector between antenna j at
where h m
r (k,t,n)= H (k,t)· x (k,t,n)+n(k,t,n), for k=1 . . . K, Eq (4)
where x(k, t, n) is a vector with L “transmit” symbols sent by the L mobile stations on subband k in symbol period n of hop period t; r(k,t,n) is a vector with R received symbols obtained via the R antennas at the base station for subband k in symbol period n of hop period t; and n(k, t, n) is a noise vector for subband k in symbol period n of hop period t.
Each received symbol in r(k, t, n) thus contain a component of each of the L transmit symbols in x(k, t, n). The L transmit symbols sent simultaneously by the L mobile stations on each subband k in each symbol period n of each hop period t thus interfere with one another at the base station.
M zf(k,t)=[ H H(k,t)· H (k,t)]−1 ·H H(k,t), Eq (5)
where “H” denotes a conjugate transpose. The base station estimates the channel response matrix H(k, t) for each subband, e.g., based on pilots transmitted by the mobile stations. The spatial processing of pilot symbols may be any manner as previously described herein.
where {circumflex over (x)} zf (k, t, n) is a vector with L “detected” data symbols for subband k in symbol period n of hop period t; and n zf (k, t, n) is the noise after the zero-forcing processing. A detected data symbol is an estimate of a data symbol sent by a mobile station.
M mmse(k, t)=[ H H(k,t)· H (k, t)+σ2 ·I] −1 ·H H(k, t). Eq (7)
If the covariance matrix φ nn of the noise is known, then this covariance matrix may be used in place of σ2·Iin equation (10).
where D mmse (k, t) is a diagonal vector containing the diagonal elements of a matrix [M mmse (k, t)·H(k, t)], or D mmse (k, t)=diag [M mmse (k, t)·H(k, t)]; and n mmse (k, t, n) is the noise after the MMSE processing.
M mrc(k, t)= H H(k, t). Eq (9)
where D mrc (k,t) is a diagonal vector containing the diagonal elements of a matrix [H H (k, t)·H(k, t)], or D mrc (k, t)=diag [H H (k, t)·H(k, t)]; and n mrc (k, t, n) is the noise after the MRC processing.
Claims (47)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/132,765 US7768979B2 (en) | 2005-05-18 | 2005-05-18 | Separating pilot signatures in a frequency hopping OFDM system by selecting pilot symbols at least hop away from an edge of a hop region |
TW095117469A TWI318846B (en) | 2005-05-18 | 2006-05-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
CN200680025154XA CN101379840B (en) | 2005-05-18 | 2006-05-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
PCT/US2006/019434 WO2006125150A2 (en) | 2005-05-18 | 2006-05-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
KR1020077029138A KR100966407B1 (en) | 2005-05-18 | 2006-05-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
JP2008512541A JP4690456B2 (en) | 2005-05-18 | 2006-05-17 | Softer and soft handoff in orthogonal frequency division wireless communication systems |
EP06760176.5A EP1884051B1 (en) | 2005-05-18 | 2006-05-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
US12/818,078 US8045988B2 (en) | 2005-05-18 | 2010-06-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
Applications Claiming Priority (1)
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US11/132,765 US7768979B2 (en) | 2005-05-18 | 2005-05-18 | Separating pilot signatures in a frequency hopping OFDM system by selecting pilot symbols at least hop away from an edge of a hop region |
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US12/818,078 Division US8045988B2 (en) | 2005-05-18 | 2010-06-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
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US20060291371A1 US20060291371A1 (en) | 2006-12-28 |
US7768979B2 true US7768979B2 (en) | 2010-08-03 |
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US11/132,765 Expired - Fee Related US7768979B2 (en) | 2005-05-18 | 2005-05-18 | Separating pilot signatures in a frequency hopping OFDM system by selecting pilot symbols at least hop away from an edge of a hop region |
US12/818,078 Active US8045988B2 (en) | 2005-05-18 | 2010-06-17 | Softer and soft handoff in an orthogonal frequency division wireless communication system |
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US (2) | US7768979B2 (en) |
EP (1) | EP1884051B1 (en) |
JP (1) | JP4690456B2 (en) |
KR (1) | KR100966407B1 (en) |
CN (1) | CN101379840B (en) |
TW (1) | TWI318846B (en) |
WO (1) | WO2006125150A2 (en) |
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JP2008546256A (en) | 2008-12-18 |
KR20080015855A (en) | 2008-02-20 |
WO2006125150A3 (en) | 2008-07-17 |
US8045988B2 (en) | 2011-10-25 |
TW200708158A (en) | 2007-02-16 |
TWI318846B (en) | 2009-12-21 |
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JP4690456B2 (en) | 2011-06-01 |
US20100254354A1 (en) | 2010-10-07 |
US20060291371A1 (en) | 2006-12-28 |
WO2006125150A2 (en) | 2006-11-23 |
EP1884051B1 (en) | 2016-11-02 |
EP1884051A4 (en) | 2013-05-08 |
EP1884051A2 (en) | 2008-02-06 |
KR100966407B1 (en) | 2010-06-28 |
CN101379840A (en) | 2009-03-04 |
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